Melvin Price Locks and Dam is a dam and two locks at river mile 200.78 on the Upper Mississippi River, about north of Saint Louis, Missouri. The collocated , explains the structure and its engineering. Background Construction began in 1979, the main lock opened in 1990, and the full structure was completed in 1994. It replaced the earlier Lock and Dam No. 26, demolished in 1990, and is the first replacement structure on the Upper Mississippi River nine-foot navigation project. The main lock is long and wide; the auxiliary is long and wide. The main lock has a vertical lift gate and a miter gate while the aux. lock has two miter gates. The dam is long with 9 tainter gates, each wide by high. It is named after Illinois Congressman Charles Melvin Price. Gallery References External links Melvin Price Locks and Dam - U.S. Army Corps of Engineers National Great Rivers Museum (USACE) U.S. Army Corps of Engineers, Rivers Project Office Hydroacoustic Identification and Sampling of Fish Aggregations in Tailwater Areas (2005 Monitoring Report – Fish Passage Melvin Price Locks and Dam, Alton, Illinois and Lock and Dam 22, Saverton, Missouri) Map of Melvin Price Locks and Dam area Dams in Illinois Buildings and structures in Madison County, Illinois Mississippi River locks Buildings and structures in St. Charles County, Missouri Dams in Missouri United States Army Corps of Engineers dams Transport infrastructure completed in 1990 Historic American Engineering Record in Illinois Historic American Engineering Record in Missouri Gravity dams Dams on the Mississippi River Mississippi Valley Division Transportation buildings and structures in Madison County, Illinois Locks of Illinois Locks of Missouri